It comes after a report by the Commerce Commission found competition was lacking in the grocery sector.
Foodstuffs North Island, which owns New World, Four Square and Pak'nSave, says it's now willing to support a consumer-focused code of conduct that aims to treat suppliers better.
It adds it'll look at simplifying promotions and loyalty schemes.
Consumer NZ Chief Executive Jon Duffy says told Kate Hawkesby the company is doing the bare minimum.
"This was inevitable, that the code of conduct for suppliers is very much the low-hanging fruit in the analysis that's being done, it was going to happen."
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